chore: Remove Terra pages since they have a new home

[GildedRoach]

The site isn't live yet (I'm not sure why) so this should maybe be merged after it is.

I created an archive branch for the old docs as well.

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[madonuko]

should redirect or write something something we have a new site now please go to blah

[GildedRoach]

should redirect or write something something we have a new site now please go to blah

I tried to write redirects for the Terra pages but it failed because the pages didn't exist, I'm not sure if it needs some special approach?

[madonuko]

https://github.com/FyraLabs/devdocs/blob/gil/chore/terra/app/(home)/page.tsx#L13

if you know how to you can create app/terra/[...slug]/page.tsx and redirect to the docs.terrapkg.com

or the easiest solution would be to put a message into the mdx instead of removing them

[Owen-sz]

We also need to redirect in any other repos that currently point here for terra docs

[Owen-sz]

There's also references to the Terra pages in other devdocs sections that will need to be updated.

[GildedRoach]

There's also references to the Terra pages in other devdocs sections that will need to be updated.

Which ones did I miss?

[Owen-sz]

Oh it looks like you got them all in the RPM section, I'll look later

[GildedRoach]

I'm honestly not married to the General category, let me know if you think it should go in Reference instead.